Product Description:

The PMB31D-20100-01 brushless servomotor is produced by Pacific Scientific for the PMB Brushless Servomotors series. This NEMA-frame device couples to a compatible digital servo amplifier to develop torque and speed profiles required by automated packaging machinery, material-handling portals, and light machining spindles. Within such systems, the motor acts as the electromechanical actuator that translates controller commands into controlled rotary motion. Its brushless design supports repeatable motion in applications that require accurate starts, stops, and speed changes.

Its frame corresponds to NEMA Size 34, meaning the mounting face and pilot dimensions match other 3.4-inch square motors and fit standard mechanical plates. Under worst-case stall conditions, the winding draws 5.4 ARMS, so drive sizing must account for that current demand to avoid thermal overload. Position feedback is furnished by a resolver, providing absolute rotor angle and noise immunity for closed-loop control in electrically noisy plant environments. Power and feedback exit the housing through flying leads with AMP connectors, allowing quick plug-in during assembly and eliminating the need for a separate terminal box. Torque is transmitted through a square key on the shaft, giving positive mechanical engagement between the motor and the driven component.

To complement those electrical and mechanical features, the motor is supplied with a shaft seal, limiting the ingress of lubricants or debris and helping preserve resolver accuracy over time. Magnetic stack height is fixed by Stack Length Multiple 1. This indicates the shortest lamination set in the PMB family and helps keep inertia low for fast acceleration. A shorter stack also supports quicker changes in speed or direction during repeated positioning moves.